BS 7786-2006 Specification for unsintered PTFE tapes for general use《航空航天系列 MoS2润滑的耐热钢制自锁六角螺母 等级1100 MPa (环境温度)315℃》.pdf
《BS 7786-2006 Specification for unsintered PTFE tapes for general use《航空航天系列 MoS2润滑的耐热钢制自锁六角螺母 等级1100 MPa (环境温度)315℃》.pdf》由会员分享,可在线阅读,更多相关《BS 7786-2006 Specification for unsintered PTFE tapes for general use《航空航天系列 MoS2润滑的耐热钢制自锁六角螺母 等级1100 MPa (环境温度)315℃》.pdf(20页珍藏版)》请在麦多课文档分享上搜索。
1、BS 7786:2006Specification for unsintered PTFE tapes for general useICS 83.140.99NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBRITISH STANDARDPublishing and copyright informationThe BSI copyright notice displayed in this document indicates when the document was last issued. B
2、SI 2006ISBN 0 580 48936 1The following BSI references relate to the work on this standard:Committee reference PSE/2Draft for comment 06/30143310 DCPublication historyFirst published as BS 4375, December 1968First published as BS 7786, June 1995Second (present) edition, August 2006Amendments issued s
3、ince publicationAmd. no. Date Text affectedBS 7786:2006 BSI 2006 iBS 7786:2006ContentsForeword ii1 Scope 12 Normative references 13 Information and requirements to be agreed and documented 24 Composition 35 Appearance and finish 46 Tape grades 47 Tape dimensions 48 Sealing 59 Thread wrapping 510 Sam
4、pling 511 Packaging and marking 6AnnexesAnnex A (normative) Determination of residual lubricant content 7Annex B (informative) Explanatory note on tape grades 8Annex C (normative) Determination of mass per unit area 11Annex D (normative) Measurement of tape dimensions 12Annex E (normative) Thread wr
5、apping test 13Bibliography 14List of figuresFigure B.1 Mass per unit area/density/thickness relationships 10Figure E.1 Thread wrapping test 13List of tablesTable 1 Tape grades 4Summary of pagesThis document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 14, an inside back
6、 cover and a back cover.BS 7786:2006ii BSI 2006ForewordPublishing informationThis British Standard was published by BSI and came into effect on 31 August 2006. It was prepared by Technical Committee PSE/2, Jointing materials and compounds. A list of organizations represented on this committee can be
7、 obtained on request to its secretary.SupersessionThis British Standard supersedes BS 7786:1995, which is withdrawn.Relationship with other publicationsThere are two standards covering unsintered PTFE tapes. This British Standard specifies requirements for tapes for general use at a wide range of te
8、mperatures. BS EN 751-3 specifies requirements for tapes for use in very specific circumstances at a more limited range of temperatures.Information about this documentThis is a full revision of the standard. The principal change has been to make all unsintered PTFE tapes manufactured in accordance w
9、ith BS 7786 suitable for use with an oxygen-enriched environment.Hazard warningsPresentational conventionsThe provisions of this standard are presented in roman (i.e. upright) type. Its requirements are expressed in sentences in which the principal auxiliary verb is “shall”.Commentary, explanation a
10、nd general informative material is presented in smaller italic type, and does not constitute a normative element.Contractural and legal considerationsThis publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Compliance
11、with a British Standard cannot confer immunity from legal obligations.WARNING. When heated to temperatures above 260 C, PTFE will begin to degrade and the rate of degradation will increase with increasing temperature. The gases produced during degradation will vary according to the temperature and o
12、ther conditions but will invariably contain toxic components. Where accidental or unavoidable exposure of PTFE to heat and/or flame occurs, good ventilation is therefore essential.WARNING. This British Standard calls for the use of substances and/or procedures that can be injurious to health if adeq
13、uate precautions are not taken. It refers only to the technical suitability and does not absolve the user from legal obligations relating to health and safety at any stage. BSI 2006 1BS 7786:20061 ScopeThis British Standard specifies requirements for unsintered polytetrafluoroethylene (PTFE) tapes w
14、ith a mass per unit area within the range 25 g/m2to 300 g/m2and with a thickness in the range 0.05 mm to 0.25 mm.It specifies requirements for three grades of unsintered PTFE tape, for general or special engineering applications at temperatures between 270 C and +260 C. All grades of this tape are s
15、uitable for use with most common liquids and gases and in an oxygen-enriched environment.In addition to the definitive requirements, this standard also requires the items detailed in Clause 3 to be documented. For compliance with this standard, both the definitive requirements and the documented ite
16、ms have to be satisfied.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.BS 2
17、1, Specification for pipe threads for tubes and fittings where pressure-tight joints are made on the threads (metric dimensions)BS 572:1985, Specification for interchangeable conical ground glass jointsBS 1752, Specification for laboratory sintered or fritted filters including porosity gradingBS 207
18、1:1989, Specification for Soxhlet extractorsBS 6920-1, Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water Part 1: SpecificationBS EN ISO 4797:2004, Laboratory glassware Boiling flasks with conical
19、ground jointsBS EN ISO 12086-1:2006, Plastics Fluoropolymer dispersions and moulding and extrusion materials Part 1: Designation system and basis for specificationsASTM D4591, Standard test method for determining temperatures and heats of transitions of fluoropolymers by differential scanning calori
20、metryBS 7786:20062 BSI 20063 Information and requirements to be agreed and documented3.1 Information to be supplied by the purchaserThe information to be supplied by the purchaser shall be fully documented. Both the definitive requirements specified throughout the standard and the following document
21、ed items shall be satisfied before a claim of compliance with the standard can be made and verified:a) the grade and thickness of tape chosen;b) the intended application for the PTFE tape, including any relevant British, European or international application standards;NOTE 1 Some specific applicatio
22、ns are covered in BS EN 751-3.c) the maximum intended working pressure;NOTE 2 The maximum working pressure will depend upon the grade and thickness of the tape, the method of application, the number of wraps, the size and quality of the fittings (threads) and the specific operating environment (flow
23、 product and temperature). In specialist applications, PTFE tapes have been satisfactorily used for sealing against pressures exceeding 300 bar 1)and also for high vacuum applications.d) the width and length of tape chosen;e) whether the tape is to be used in contact with, or likely to be used in co
24、ntact with, potable water.3.2 Items for agreementThe following items to be agreed between the contracting parties, which are specified in the clauses referred to, shall be fully documented. Both the definitive requirements specified throughout the standard and the following documented items shall be
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